2 Commits

Author	SHA1	Message	Date
Zachary Harrold	d70595b667	Add core and alloc over std Lints (#15281) ... # Objective - Fixes #6370 - Closes #6581 ## Solution - Added the following lints to the workspace: - `std_instead_of_core` - `std_instead_of_alloc` - `alloc_instead_of_core` - Used `cargo +nightly fmt` with [item level use formatting](https://rust-lang.github.io/rustfmt/?version=v1.6.0&search=#Item%5C%3A) to split all `use` statements into single items. - Used `cargo clippy --workspace --all-targets --all-features --fix --allow-dirty` to _attempt_ to resolve the new linting issues, and intervened where the lint was unable to resolve the issue automatically (usually due to needing an `extern crate alloc;` statement in a crate root). - Manually removed certain uses of `std` where negative feature gating prevented `--all-features` from finding the offending uses. - Used `cargo +nightly fmt` with [crate level use formatting](https://rust-lang.github.io/rustfmt/?version=v1.6.0&search=#Crate%5C%3A) to re-merge all `use` statements matching Bevy's previous styling. - Manually fixed cases where the `fmt` tool could not re-merge `use` statements due to conditional compilation attributes. ## Testing - Ran CI locally ## Migration Guide The MSRV is now 1.81. Please update to this version or higher. ## Notes - This is a _massive_ change to try and push through, which is why I've outlined the semi-automatic steps I used to create this PR, in case this fails and someone else tries again in the future. - Making this change has no impact on user code, but does mean Bevy contributors will be warned to use `core` and `alloc` instead of `std` where possible. - This lint is a critical first step towards investigating `no_std` options for Bevy. --------- Co-authored-by: François Mockers <francois.mockers@vleue.com>	2024-09-27 00:59:59 +00:00
Adam	9bda913e36	Remove redundent information and optimize dynamic allocations in Table (#12929) ... # Objective - fix #12853 - Make `Table::allocate` faster ## Solution The PR consists of multiple steps: 1) For the component data: create a new data-structure that's similar to `BlobVec` but doesn't store `len` & `capacity` inside of it: "BlobArray" (name suggestions welcome) 2) For the `Tick` data: create a new data-structure that's similar to `ThinSlicePtr` but supports dynamic reallocation: "ThinArrayPtr" (name suggestions welcome) 3) Create a new data-structure that's very similar to `Column` that doesn't store `len` & `capacity` inside of it: "ThinColumn" 4) Adjust the `Table` implementation to use `ThinColumn` instead of `Column` The result is that only one set of `len` & `capacity` is stored in `Table`, in `Table::entities` ### Notes Regarding Performance Apart from shaving off some excess memory in `Table`, the changes have also brought noteworthy performance improvements: The previous implementation relied on `Vec::reserve` & `BlobVec::reserve`, but that redundantly repeated the same if statement (`capacity` == `len`). Now that check could be made at the `Table` level because the capacity and length of all the columns are synchronized; saving N branches per allocation. The result is a respectable performance improvement per every `Table::reserve` (and subsequently `Table::allocate`) call. I'm hesitant to give exact numbers because I don't have a lot of experience in profiling and benchmarking, but these are the results I got so far: *`add_remove_big/table` benchmark after the implementation:*  *`add_remove_big/table` benchmark in main branch (measured in comparison to the implementation):*  *`add_remove_very_big/table` benchmark after the implementation:*  *`add_remove_very_big/table` benchmark in main branch (measured in comparison to the implementation):*  cc @james7132 to verify --- ## Changelog - New data-structure that's similar to `BlobVec` but doesn't store `len` & `capacity` inside of it: `BlobArray` - New data-structure that's similar to `ThinSlicePtr` but supports dynamic allocation:`ThinArrayPtr` - New data-structure that's very similar to `Column` that doesn't store `len` & `capacity` inside of it: `ThinColumn` - Adjust the `Table` implementation to use `ThinColumn` instead of `Column` - New benchmark: `add_remove_very_big` to benchmark the performance of spawning a lot of entities with a lot of components (15) each ## Migration Guide `Table` now uses `ThinColumn` instead of `Column`. That means that methods that previously returned `Column`, will now return `ThinColumn` instead. `ThinColumn` has a much more limited and low-level API, but you can still achieve the same things in `ThinColumn` as you did in `Column`. For example, instead of calling `Column::get_added_tick`, you'd call `ThinColumn::get_added_ticks_slice` and index it to get the specific added tick. --------- Co-authored-by: James Liu <contact@jamessliu.com>	2024-09-16 22:52:05 +00:00